Function create_frame 

pub fn create_frame(
    local_name: &str,
    attrs: &AttributeMap,
    name_table: &NameTable,
    source: Option<SourceRef>,
    ns_snapshot: &NamespaceContextSnapshot,
) -> SchemaResult<Box<dyn Frame>>

Create a frame for the given element

The namespace snapshot is used to resolve QName references in attributes (type, ref, base, substitutionGroup, etc.) during frame construction.